Lithium ion-electron mixed conductor modified ternary anode material and preparation method

A technology of positive electrode materials and mixed conductors, which is applied in the field of lithium ion-electronic mixed conductor modified ternary positive electrode materials and its preparation, can solve the problems of restricting the performance of ternary materials, irreversible capacity loss, poor electronic conductivity, etc., and achieve good lithium Ion and electron conductivity, improvement of lithium ion conductivity and electron conductivity, effect of slowing down corrosion

Inactive Publication Date: 2018-05-29
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ternary materials also have obvious disadvantages: Li + / Ni 2+ Easy to generate mixed discharge to hinder the diffusion of lithium ions, resulting in irreversible capacity loss; poor cycle performance under high potential and high current; small tap density, etc.
However, due to the low lithium ion conductivity of the coating layer such as oxides and the low electronic conductivity of lithium ion conductive materials, the further improvement of the performance of ternary materials is restricted, so it is necessary to design a ternary material with high lithium ion conductivity and A coating layer with a certain electronic conductivity is used to further improve the electrochemical performance of the ternary material
[0006] Lithium magnesium phosphate (LiMgPO 4 ) has good lithium ion conductivity, but the electronic conductivity is poor. If lithium magnesium phosphate is doped with high-valent ions, such as trivalent aluminum ion doping to replace magnesium ions or fluorine ions to replace oxygen in the lattice, it can Significantly improve the conductivity of lithium magnesium phosphate

Method used

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  • Lithium ion-electron mixed conductor modified ternary anode material and preparation method
  • Lithium ion-electron mixed conductor modified ternary anode material and preparation method
  • Lithium ion-electron mixed conductor modified ternary anode material and preparation method

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Embodiment 1

[0041] The preparation method of the lithium ion battery cathode material coated with the lithium ion-electron mixed conductor material of this embodiment is carried out according to the following steps:

[0042] (1) Take an appropriate amount of lithium acetate dihydrate (CH 3 COOLi 2 ·H 2 O), magnesium nitrate (Mg(NO 3 ) 2 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and ammonium fluoride (NH 4 F) be dissolved in water successively, add the citric acid (C 6 h 8 o 7 ) as a dispersant, after fully stirring to obtain a clear and transparent solution, in a volumetric flask, use deionized water to set the volume to 0.1mol / L, which is solution A;

[0043] (2) Weigh a certain quality of 811 type nickel-cobalt-manganese ternary positive electrode powder, according to LiMgPO 4 f 0.05 The coating amount is 2% mass ratio calculation Add solution A, stir and mix thoroughly at room temperature;

[0044] (3) Evaporating the solid-liquid mixture to dryness to obtain a sol...

Embodiment 2

[0047] The preparation method of the lithium ion battery cathode material coated with the lithium ion-electron mixed conductor material of this embodiment is carried out according to the following steps:

[0048] (1) Take an appropriate amount of lithium acetate dihydrate (CH 3 COOLi 2 ·H 2 O), magnesium nitrate (Mg(NO 3 ) 2 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and ammonium fluoride (NH 4 F) be dissolved in water successively, add the citric acid (C 6 h 8 o 7 ) as a dispersant, after fully stirring to obtain a clear and transparent solution, in a volumetric flask, use deionized water to set the volume to 0.1mol / L, which is solution A;

[0049] (2) Weigh a certain quality of 523 type nickel-cobalt-manganese ternary positive electrode powder, according to LiMgPO 4 f 0.05 The coating amount is 2% mass ratio calculation Add solution A, stir and mix thoroughly at room temperature;

[0050] (3) Evaporating the solid-liquid mixture to dryness to obtain a sol...

Embodiment 3

[0053] The preparation method of the lithium ion battery cathode material coated with the lithium ion-electron mixed conductor material of this embodiment is carried out according to the following steps:

[0054] (1) Take an appropriate amount of lithium acetate dihydrate (CH 3 COOLi 2 ·H 2 O), magnesium nitrate (Mg(NO 3 ) 2 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and ammonium fluoride (NH 4 F) be dissolved in water successively, add the citric acid (C 6 h 8 o 7 ) as a dispersant, after fully stirring to obtain a clear and transparent solution, in a volumetric flask, use deionized water to set the volume to 0.1mol / L, which is solution A;

[0055] (2) Weigh a certain quality of 811 type nickel-cobalt-manganese ternary positive electrode powder, according to LiMgPO 4 f 0.05 The coating amount is 2% mass ratio calculation Add solution A, stir and mix thoroughly at room temperature;

[0056] (3) Evaporating the solid-liquid mixture to dryness to obtain a sol...

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Abstract

The invention discloses a lithium ion-electron mixed conductor modified ternary anode material and a preparation method. A layer of lithium-containing phosphate is arranged on the surface of the ternary anode material, a main ingredient magnesium lithium phosphate of the coating layer serves as a lithium ion conductor material and has better lithium ion electric conductive performance, and electronic conductivity of the coating layer can be improved by doping trivalent and tetravalent metal ions or F ions; thus, the coating layer has better lithium ion and electron conduction performance at the same time. The modified ternary anode material can work under higher voltage and remarkably improve battery capacity; furthermore, cycle performance, rate capability, overcharging performance and safety performance of the modified ternary anode material are greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion-electron mixed conductor modified ternary positive electrode material and a preparation method thereof. Background technique [0002] The energy crisis has become the most serious problem in the 21st century, and the key to realize the intelligentization of new energy supply lies in the development of battery technology. Among them, lithium-ion batteries have rapidly occupied the electronic product market by virtue of their advantages such as high energy density, long cycle life, small self-discharge, and no memory effect. They have gradually expanded from portable electronic products such as mobile phones, digital cameras, and laptops to electric vehicles, Large-scale power supply and energy storage and other fields, and become the best choice for the next generation of electric vehicle power batteries. However, the voltage platform and capacity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/58H01M10/0525C01B25/26C01B25/45
CPCC01B25/26C01B25/45H01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 申斌陈小平齐士博石谦杜付明
Owner 桑顿新能源科技(长沙)有限公司
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